Heney b



(No Model.)

H. E. WITE.

TELEPHONE EEGEIVEE.

Patented May 20,' 1884. jij-L nga lllI

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WITNESSES y N. PEYERS. PhawLimugmphar, washingm. n. c.

i HENRY E. VAITE, OF NEI/V YORK, N. Y., ASSIGNOR TO CHARLES E.` LIVER- MORE, TRUSTEE, OF SAME PLAGE.

TELEPHONERECIElVER.

SPECIFICATION forming part of Letters Patent No. 298,924, dated May 20, 1884.

Application filed November 27, 1883. (No model.)

To a/ZZ whom it may concern:

Be it known that I, HENRY E. Wairn, of New York, county of New York, and State of New York, have invented a new and useful Improvement in Telephone-Receivers, of which the following is a full, clear, and exact description, reference being had to the accompanying drawings, making part of this speciication.

My invention relates to atelephone-receiver wherein two diaphragms and two magnetic cores are arranged between the poles of a permanent magnet; and the improvement consists, primarily, in mounting two magnetic cores upon the north and south poles of the magnet to face each other, and in suspending between said cores a drumformed of two diaphragms secured to the opposite sides of the ring, the

said diaphragms being secured to the magnetic cores, by which means the most ample vibration of the diaphragms is obtained, and the drum will constitute a resonating-box: of greater intensity and sensitiveness. An ear tube is connected with the interior of the drum; and my invention further consists in making one of the magnetic cores to which the drum is attached tubular, and connecting the ear-tube' with the interior of the drum through the said tubular magnetic core.

In the accompanying drawings, Figure 1 rep resents my improved receiver in side elevation. Fig. 2 represents a portion of the same, partly in section, and Fig. 3 also represents the same, partly in section, showing a modifica tion in the manner of applying the ear-piece.

A represents a magnet of U shape with its ends turned inward toward each other, or provided with inwardlyextending arms a and a', forming its poles, arranged in the same transverse linc,with their ends facing each other, as shown. Upon these arms,which form cores therefor, are placed n1the spools or coils B and B, and upon or to theirextreme inner or adjacent ends are secured diaphragms or disks O and C', one, C, being clamped against the end of the arm c by a headed screw, c,'and the other, G, having its central perforation enlarged to receive the end of arm c', upon which it is held by a headed screw, c, the arrangement being such that one of the disks is clamped firmly to its `arn1,while the other is free to turn or be adjusted upon its arm. The two diaphragms C and C are connected at their peripheries by a covering, D, of Ithin wood or other suitable material, in such man ner as to form, with their covering, a shallow cylindrical resonating-box or drum, in which the poles of the magnet terminate, as shown. rlhe shell or connectingcover is perforated at one point, d, to receive the central terminal tube, e, of the ear-piece E,which may be of any usual or preferred form.

In Fig. 3, instead of perforating the cover D to receive the ear-piece, one of the arms, a., of the magnet is made tubular, opening at its inner end into the drum or resonating-box, and the ear-piece is applied to the outer side or end of said tubular arm, as shown. In this construction the inner end of the arm is shouldered, or provided with an offset, a2, against which the diaphragm C is clamped by a nut, c2, on the threaded inner end of said arm. The coil or spool B', like the diaphragm or side C of the box or drum on the arm c, is loose thereon, and will readily conform to any adjustment of the diaphragm C and spool B on the arm ci for setting the ear-piece E when applied to the periphery of the drum at any desired or convenient angle of relation to the magnet A,which, as shown, forms also the handle of the receiver. The wires of the spools or coils B and B are connected one with the other by a wire, b, andwith binding-posts and the line-wires in any usual manner.

In operation, under the action of the current, the disturbances produced thereby operate to cause a lateral vibration of the parallel arms of the U -shaped magnetA, and also a slight expansion and contraction in length of the two horizontal spool-carrying arms c and a. The vibrations of the two parallel arms of the magnet and the expansion and contraction ofthe horizontal spool-carrying arms together act upon the diaphragms and produce corresponding disturbances or vibrations therein, which are conveyed through the resonating-chamber, and thence to the ear of the listener.

Havingfuow described my invention, I claim as newl. In a telephone, a resonatingbox composed of two parallel diaphragms connected at their IOC edges bya suitable rim, an ear-tube communicating with the interior of said box, and the diaphragms thereof connected to -a magnet, substantially as described.

2. A telephone resonating-boX composed of two diaphragms united at their edges by a- 4. In a telephone, the combination of the permanent magnet, the magnetic cores secured to poles of the magnet, the resonator-box mounted upon and supported between said cores, and an ear-tube communicating with 2o the interior ofvsaid box through the tubular magnetic core, substantially as described.

In testimony whereof I have hereunto set myhand this 23d day of November, A. D. 1883.

HENRY E. WAITE.

Witnesses E. L. WHITE, REX. M. SMITH. 

